The error “Closure: ()=> Map from Function ‘toJson’” usually occurs when there is an issue with converting a class instance to a JSON object

The error “Closure: ()=> Map from Function ‘toJson’” usually occurs when there is an issue with converting a class instance to a JSON object. Here are methods to solve this issue

Step-by-Step Guide:

1. Check the toJson Method: Ensure your toJson method is correctly implemented. It should return a Map<String, dynamic>.

class MyClass {
  String name;
  int age;

  MyClass({required this.name, required this.age});

  Map<String, dynamic> toJson() {
    return {
      'name': name,
      'age': age,
    };
  }
}

Avoid Using Closures in toJson: Ensure no closures are being returned by the toJson method. It should directly return a map.

Check the Usage of toJson: Make sure you are calling toJson properly in your code.

MyClass instance = MyClass(name: 'John', age: 30);
Map<String, dynamic> json = instance.toJson();